"unlocking" could be "activating", "releasing", "accessing". activating.
"Take Advantage of Offline Viewing: Download content for offline viewing to ensure uninterrupted entertainment." "Take Advantage" → Exploit. "Download" → Obtain. 18 tv app
"How to Get Started with the 18 TV App" "How to Get Started" could be Methods to Commence. "Getting started" commencing the process. "App" software. "unlocking" could be "activating", "releasing", "accessing"
following: abiding